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Certain Rack Automatic Transfer Switch (ATS) models can support both 208VAC and 230VAC operation, by design. Consequently, they are used in different parts of the world. The default configuration is 230VAC. For North America 208VAC environments, a configuration change must be made during initial setup for proper operation.

Product Line

Rack Automatic Transfer Switch (ATS)

AP7721

AP7723

AP7724

Environment

Most North America installations

208VAC input voltage environments

All serial numbers

All firmware versions

Cause

The default Line VRMS (nominal voltage setting) for the AP7721, AP7723, and AP7724 is 230VAC.

Please note: In order to use this in majority of North American installations (which are typically 208VAC), a configuration change must be made or the ATS will not function properly. It also may report a fault prior to the required setting change.

Resolution

Change the Line VRMS (nominal input voltage) setting via the web or Telnet/SSH/serial cable prior to attaching any equipment and completing the installation.

Using serial cable/local connection/terminal emulation:

Using the included serial configuration cable (part number 940-0144) and connect at the default port settings using a terminal emulation program such as HyperTerminal, PuTTy, or similar:

9600 baud rate

8 data bits

parity none

1 stop bits

Note: for more detailed setup instructions, view knowledge base article ID FA156064 which includes how to access the local serial console as well as configuring TCP/IP settings